sock help?

[ghoti]

So I'm working on a pair of socks, and I'm still new enough at socks that I'm not sure if this is a glitch in the pattern or if I'm not reading it correctly, or what.

Pattern is "Just Yer Basic Sport Sock" (ravelry link to pattern).

I've just gotten to the part where I want to start the heel flap ... and it says:

The heel flap is worked over the first 24 (28) stitches of your round. The other 24 (28) stitches are the instep stitches, which will be held in place on the needles while you knit the heel flap. When you reach the end of your last round for the leg, continue as follows:
Set-up:
Row 1: Knit across 12 (14) stitches. Turn your work – you’ll knit the next row on the wrong side (purl bumps) of the sock.
Row 2: Slip first stitch purlwise, purl across remaining 23 (27) stitches. (You’ll be working back across the first and fourth needles of your round.) Turn your work – you’ll be knitting on the right side again on the next row.

If I'm reading this correctly, you knit your first needle, then turn around and purl your first and fourth needles. Wouldn't that make the heel just *slightly* imbalanced, having that extra row on needle 1?